首页> 外文期刊>The Astrophysical journal >CHANDRA OBSERVATIONS OF THE TRANSIENT 7 s X-RAY PULSAR AX J1845.0-0258
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CHANDRA OBSERVATIONS OF THE TRANSIENT 7 s X-RAY PULSAR AX J1845.0-0258

机译:瞬态7 s X射线脉冲星J1845.0-0258的CHANDRA观测

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摘要

We present the results of Chandra X-Ray Observatory observations of the transient anomalous X-ray pulsar candidate AX J1845.0-0258 in apparent quiescence. Within the source's error circle, we find a point source and possible counterpart, which we designate CXOU J184454.6—025653. No coherent pulsations are detected, and no extended emission is seen. The source's spectrum is equally well described by a blackbody model of temperature kT ~ 2.0 keV or a power-law model with photon index Γ ~ 1.0. This is considerably harder than was seen for AX J1845.0-0258 during its period of brightening in 1993 (kT ~ 0.6 keV) despite being at least ~13 times fainter. This behavior is opposite to that observed in the case of the established transient AXP, XTE J1810—197. We therefore explore the possibility that CXOU J184454.6-025653 is an unrelated source and that AX J1845.0-0258 remains undetected since 1993, with a flux 260-430 times fainter than at that epoch. If so, this would represent an unprecedented range of variability in AXPs.
机译:我们提出了Chandra X射线天文台观察到的结果,这些现象是暂时静止的X射线脉冲星候选AX J1845.0-0258。在源的误差圈内,我们找到了点源和可能的对等点,我们将其指定为CXOU J184454.6—025653。没有检测到相干脉动,也没有看到扩展的发射。通过温度kT〜2.0 keV的黑体模型或光子指数Γ〜1.0的幂律模型同样可以很好地描述光源的光谱。这比AX J1845.0-0258在1993年发亮期间(kT〜0.6 keV)所遇到的困难要大得多,尽管它至少暗淡了约13倍。此行为与在已建立的瞬态AXP XTE J1810-197中观察到的行为相反。因此,我们探讨了CXOU J184454.6-025653是无关的来源,以及自1993年以来仍未检测到AX J1845.0-0258的可能性,其通量是那个时期的260-430倍。如果是这样,这将代表AXP的变化范围前所未有。

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